<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
		<style>
			h1.one {
				color: red;
			}
		</style>
	</head>
	<body>
		<h1 class="one">hello world</h1>
		<h1 class="two">hello world</h1>
		<h1 class="three">hello world</h1>
		<h1 class="four">hello world</h1>
	</body>
</html>
